Flask



FIG. 1 is a top, front and right side perspective view of a flask embodying my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevational view thereof, the rear elevational view being identical; and,

FIG. 4 is a right side elevational view thereof, the left side elevational view being identical. 

The ornamental design for a flask, as shown and described. 